nested expression workaround?

Does anyone know of a workaround for nested expressions?

I need to do the following (which is not petal-safe)

<span tal:repeat="object Objects">
	<span tal:content="object/object_id">id</span> - <span  
tal:content="object/object_name">name</span>
	<hr/>
	<span tal:content="additional_info/${object/object_id}"/>
</span>

anyone know if there's a workaroudn for this sort of thing?